docs: def GetWaveSet(self):
          """Obtain the wavelength set for the composite spectrum.
          This is done by using :func:`MergeWaveSets` to form a union of
          wavelength sets from its components.
  
          Returns
          -------
          waveset : array_like
              Composite wavelength set.
  
          """
          wave1 = self.component1.GetWaveSet()
          wave2 = self.component2.GetWaveSet()
          return MergeWaveSets(wave1, wave2)